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The Snap-On series 71-M was produced from about WWII until around 1965...I haven't seen one with a "crank" handle addition before, but at the end of the ratchet's handle, there is a "hanging" hole, so that additional handle may have been added easily enough.
I have seen ratchets with a "hex" interior used for applications, like on trucks, heavy equipment - that would even be handy for lowering/raising the spare tire on several models of American pickup trucks...
In one of GregP's pictures of a P-59 cockpit it shows a adapted Snap-On ratchet being used as a emergency gear extension handle.
It not like those ratchets though.
I've used those before, but they're twice as big as these ratchet based "whatevers".
These look like they're based on a ordinary 1/2 inch ratchet, those truck landing gear handles are a great deal bigger.
The Photo of the P-59 cockpit is in Aviation thread on page 2, A6M5 model 52 Zero, reply 62.
That was a long time back and it makes me want to kick myself for posting multiple planes in stead of staying with a narrower topic line. At the time I was posting a lot of Planes of Fame stuff in one post, but it makes it hard to find.
I'll get another pic of the Snap-On emergency gear handle Saturday and post it in here.
Welcome to the forum!
- Greg